Backless bobbin carrier for braiding machines and the like



Sept W, 1940. A. J. ANDREWS BACKLESS BOBBIN CARRIER FOR BRAIDING MACHINES AND THE LIKE Filed April 22, 1940 wucrhvv Hugua JT' Him/ferm Patented Sept. 10, 1940 UNITED STATES BACKLESS BOBBIN CARRIER FOR BRAID- ING MACHINES AND THE LIKE Augusto J. Andrews, Pawtucket, R. I. Application April 22, 1940, Serial No. 331,065

3 Claims.

This invention relates to certain new and useful improvements in backless bobbin carriers for braiding machines and the like.

It has been customary in the prior art to provide a bobbin carrier for braiding machines and the like with a back or supporting element to accommodate the mounting of yarn tensioning mechanism and in bobbin carriers of such ccnstruction the size of the bobbin is materially limited.

It is therefore a primary object of this invention to eliminate the back or support on the bobbin carrier so that a much larger bobbin carrying several thousand additional yards of yarn may be used, and with such increased size in the bobbin, the necessity for frequent changes is materially reduced.

In lieu of the usual yarn tensioning mechanism heretofore mounted upon the back or support of the bobbin carrier, the present invention provides a Weighted member within the core of the bobbin for association with the yarn to impart the desired tension thereto.

, It is a further object of the invention to utilize the novel type of weighted yarn tensioning device in combination with a stop-motion arm wherein the weighted yarn tensioning device normally held in spaced relation from the stopmo-tion arm by its association with the yarn being tensioned and which weighted device upon the breakage of the yarn forcibly and gravitationally moves downwardly for the operation of the stopmotion arm to bring the braiding machine or the like to rest.

With the above and other objects in view that will become apparent as the nature of the invention is better understood, the same consists in genera-l of certain novel details of construction and combination of parts hereinafter more fully described, illustrated in the accompanying drawing, and claimed.

In the accompanying drawing:

Figure lis a side elevational view, partly broken away and shown in section, of a backless bobbin carrier for braiding machines and the like, a bobbin and its thread or yarn being illustrated by dotted lines, the yarn tensioning suspended weight illustrated as slidable within the core of the bobbin and normally positioned above the stopmotion arm, the latter being illustrated by full lines in the working position of the machine and by dotted lines in its stop-motion position,

Figure 2 is a fragmentary side elevational View of the base portion of the spindle supporting the bobbin and carrying the stop-motion arm below the bobbin,

Figure 3 is a top plan View showing the revolving yarn guide at-the upper end of the carrier, and

Figure 4 is a cross-sectional view taken on line 4 4 of Figure 1.

Referring more in detail to the accompanying drawing and particularly Figures 1 and 2, there is illustrated a backless bobbin carrier for braiding machines and the like, the carrier comprising a lower supporting case 5 having at its lower end the usual sleeve Whirl 6. The supporting case 5 has a chamber 'I therein open at the upper end of the case and communicating with a lateral opening 9. The upper end of the chamber 'I is shouldered and internally threaded for the threaded reception of the lower end of the tubular core 9 that supports the bobbin I0.

The yarn II extending from the bobbin III instead of being tensioned by the usual tensioning mechanism mounted upon a back or support on the supporting case has a tensioning device therefor in the form of a weight freely suspended by the yarn II within the tubular core 9. As shown in Figure 1, a revolving head I2 is carried by the upper end of the tubular core 9, said head carrying a laterally directed arm I3 having a guide eye I4 at its free end for the passage of the yarn, the latter then extending downwardly through the upper end of the tubular core 9 for association with a tensioning weight. As shown in Figures 1 and 4, the tensioning weight comprises a casing I5 lled with a heavy material I6, such as lead or the like, the upper end of the casing I5 having a yarn guide eye I'l swiveled thereto and through which eye the yarn I I freely passes to be directed upwardly and outwardly of the tubular core 9 as shown in Figure 1. A vertically threaded guide arm II)v is attached at its lower end as at I9 to the revolving head I 2 laterally of the tubular core 9 and the upper end of said guide arm t8 is bent at right angles as at 20 to provide a guide eye 2| overlying and spaced above the upper end of the tubular core 9 and through which guide eye 2| the yarn II passes to the braiding machine. The weight I 5 provides a constant even tension on the yarn I I.

The stop-motion for the braiding machine comprises a lever 22 pivotally mounted as at 23 upon a bracket arm 24 carried by the supporting case 5 adjacent the lateral opening 8, the inner end 22a of said lever projecting inwardly of said opening 8 to enter the chamber 'I in the supporting case, while the outer end 22b of said lever 22 'andi move thex latterl onv projecting outwardly of the supporting case carries an overbalancng weight 25 at the end thereof.

A trigger or contact 26 illustrated by dotted lines in Figure 1 forms a part of the stop-motion of the braiding machine.

In the normal operation of the braiding machine, the yarn II is constantly and evenly tensioned by the weight I5 with the weight normally positioned above the supporting case 5 or in spaced relation to the inner end 22a of the stop-motion lever 22, the weighted end 25 of said l stop-motion lever being at its limit of downward movement as shown in Figure 1 so that during rotation of the supporting case theV weighted end 25 of said lever is spaced from the trigger or contact 2B of the stop-motion. Should the yarn II break the weight I5 gravitationally descends by its own Weight through the tubular core 9 to engage the inner end 22a of the stop-motion lever itsV pivot 231 to elevate the outer end 25 so that the same will move-into ycontact Withthe trigger or contactls'and; effect the! stopping of the machine.

The swivel eye IFI at the upper end of the weight I5 operates to pr'eventfY twisting oi` the yarn' and, in effect, the feeding of the yarn from the bobbin has more the.' actionlof .an unwinding .movement instead of a; pullsactio'non the` yarn; The-head I2 revolves naturally Withthe'yarn as the'yarn is unwound from the bobbin |10.

Fromthefabove. detailed description of the in vention', itlI is believed that the construction and operation. will at once be apparent, and wlnle thereiis herein shown and described the-preferred embodiment thereof, it is to be understood that minor changes-maybe made in the details of construction, ,such as will fall Within the scope of the inventionas claimed.

1f. In a bobbin carrierk off the character describedga supporting case,y a tubular core rising th'erefroml for the support` of a bobbin,'. yarn guides-rotatably carriedby the upper endof the tubular core' and asweightV slidable in the tubular'Y core and having a guide eye through which the/yarmp'asses4 and forming a yarn loop in the tubular: core for tensioning the yarn, the guide eye on-the weight'being swiveled andcooperating with the rotatable yarn guides at the upper end of the tubular core to prevent twisting of the yarn during feeding thereof to a machine.

2. In a bobbin carrier of the character described, a supporting case, a tubular core rising therefrom for the support of -a bobbin, yarn guides rotatably carried by the upper end of the tubular core and a weight slidable in the tubular core and having a guide eye through which the yarn-passes and forming ayarn loop in the tubular core for tensioning the yarn; the supporting case having a chamber therein opening into the tubular core and an opening through the side Wallof the case, a stop-motion lever pivotally mounted in the case with one end extending through' said side opening into the chamber below the yarn tensioning weight, the other end of the lever being Weighted and normally depressed, and al stop motion trigger positioned above the weighted end of the lever normally spaced from the latter and adapted to be engaged thereby 20 when the yarn breaks and the weight drops into engagement with the inner end of the lever to raise the outer weighted end thereof.

3. In a bobbin carrier of the character described, a supporting case, a tubular core rising therefrom for the support of avbobbin, yarn guides rotatably carried by the upper end of the tubular core and a weight slidable in the tubular core and having a guide eye through which the yarn core for tensioning the yarn, the guide eye on the Weightbeing swiveled and cooperating with the through said side opening into the chamber be- 40 low the yarn tensioning Weight, the outer end of the lever being Weighted and normally depressed, and a stop-motion trigger positioned above the weighted end of the lever normally spaced from the latter and adapted to be engaged thereby when the yarn breaks and the weght drops into engagement with the inner end of the lever to raise the outer Weighted end thereof.

AUGUSTO J. ANDREWS.

-passes and forming a yarn loop in the tubular 30 

